Revelation 2:14-16 in the King James Version reads:

14 But I have a few things against thee, because thou hast there them that hold the doctrine of Balaam, who taught Balac to cast a stumblingblock before the children of Israel, to eat things sacrificed unto idols, and to commit fornication.

15 So hast thou also them that hold the doctrine of the Nicolaitans, which thing I hate.

16 Repent; or else I will come unto thee quickly, and will fight against them with the sword of my mouth.

This passage comes from the book of Revelation, which is the final book of the New Testament. It is a highly symbolic and apocalyptic book that contains visions and prophecies about the end times. The passage is part of a series of letters that Jesus instructs John to write to the seven churches in Asia, providing them with commendations, warnings, and instructions for correction.

In these verses, Jesus is addressing the church in Pergamos, and he begins by commending them for holding fast to his name and not denying their faith, even in the face of persecution. However, he then goes on to rebuke them for a few specific things that are happening within the church.

First, Jesus mentions that there are members of the church who hold to the doctrine of Balaam. This is a reference to the Old Testament story of Balaam, a prophet who was hired by Balak, the king of Moab, to curse the Israelites. When Balaam was unable to curse them, he advised Balak to seduce the Israelites into sinning by offering sacrifices to idols and committing sexual immorality. Essentially, Balaam's actions were aimed at undermining the moral and spiritual integrity of the Israelites. In the same way, the members of the church in Pergamos are allowing false teachings and immoral behaviors to infiltrate and corrupt the church.

Jesus also mentions the doctrine of the Nicolaitans, which he says he hates. The Nicolaitans were a group within the early Christian church who promoted a form of antinomianism, which is the belief that grace frees Christians from the moral law, so they can then engage in immoral behavior without consequence. This teaching was contrary to the message of repentance and holiness that Jesus and his apostles preached.

In both of these cases, Jesus is concerned with the spiritual and moral purity of the church. He warns the members of the church in Pergamos to repent and turn away from these false teachings and immoral behaviors. He emphasizes the urgency of this repentance by saying that if they do not, he will come quickly and fight against them with the sword of his mouth.

The sword of Jesus' mouth is a symbol of his word, which is described earlier in Revelation as a sharp, double-edged sword (Revelation 1:16). This imagery conveys the power and authority of Jesus' spoken word, which has the ability to judge, discern, and convict. In this context, it represents the judgment that will come upon those who continue in unrepentant sin.

Overall, the themes of this passage include the importance of moral and spiritual purity within the church, the dangers of false teachings and immoral behaviors, the call to repentance, and the impending judgment for those who do not heed the warning. The context of this passage is within the larger framework of the book of Revelation, which is a prophetic vision of the end times and the ultimate triumph of Christ over evil. The symbolism of the sword of Jesus' mouth underscores the seriousness of the rebuke and the urgency of the call to repentance. This passage serves as a reminder to all believers to remain faithful, steadfast, and pure in their faith, and to guard against the infiltration of false teachings and sinful behaviors within the church.